（1. Sunnywell (China) New Material Technology Co., Ltd., Changzhou 213000, China) （2. School of Materials Engineeing, Jiangsu University of Technology, Changzhou 213001, China) （3. State key Laboratory of Solicffication Processing, Northwestern Polytechnical University, Xi’an 710072, China)
This study was carried out to investigate the evolution of axial residual stress in high-carbon steel wire during multi-pass drawing and the subsequent tensile straightening. Firstly, the stress-strain relationship of the steel rod under severe deformation was obtained by means of tensile experiments. Then a numerical model for multi-pass drawing was constructed based on abaqus finite-element software, which has been verified by comparison with the experimental results. By using the numerical model, an eight-pass drawing process was simulated, and the formation and evolution mechanism of the residual stress has been revealed. After that, the variation of the residual stress after tensile straightening has been studied by numerical simulation. The results showed that, the distribution of the axial residual stress is highly inhomogeneous after drawing, which exhibit positive in the skin region and negative in the center region. The drawing passes had slight effect on the residual stress of the steel wire. In contrast, significant effect was observed after the subsequent tensile straightening. A tensile deformation as small as 0.6%~1% can dramatically reduce the residual stress, resulting a more homogeneous distribution of the residual stress in the wire.